Adjustable thermostat for radiators



Dec- 6, 1932- A.` JLHARTFIELD ADJUSTABLE THERMOSTAT; FOR RADIAToRsFi'ied May 26,

1931 `I2 SheetsSheet l ATTORNEYS.

A. HARTFIELD ADJUSTABLE THERMOSTAT FOR RADIAToRs Filed Mayzs, 1951 .2sheets-sheet 2 Patented Dec. 6, 1932 UNrr s AUJGUST Tf HARTIEIELD, OFHUNTINGTON PARK, CALFORNA, ASSIGNOR TO :PACIFIC- trier. f

GAS RADIATOR COMPANY, 'OF HNTNGTON P f, CA'L'FORNIA ADJUSTABLE'.rnnntiesrnr ron assurons. i

Application filed May 2.6,

rlhis invention relates to a heat-regulating device applicable tovarious types of heaters. An object of the invention is to provide adevicev of this kind which can be more cheaply and conveniently`attached to heaters now on thev market, and one which will notdisfigure or encumber the heater to which it is attached. l

Another object of the `invention is to simplify the thermostaticallyoperated and pressure controlled elements of the ldevice and to renderthem more positive and dependable in y their operation. f

Still another object of the invention is to provide an improvedarrangement'of cooperating thermostats whichwill under all `cohditionsinsure `a safe/operation of the heater. Yet another object of theinvention is to provide animproved connection between a fuel valve andthe means for thermostatically actuating such valve.

.Other objects, advantages and features of the invention may hereinafterappear.

Referring to the accompanying drawings 35 which illustrate what is atpresent deemed to be a preferred embodiment of the invention, Fig. 1 isan end elevation of the lower portion of a radiator showing the deviceapplied thereto. i

Fig. 3- is fa section on line 8-3 of Fig. 2. Fig. 4 is a side elevationof a radiator showing the device connected therewith. Referring indetail to the drawings, and describing first the thermostatic devicewhich is attached to the casing 10 of the radiator, said devicecomprises a bi-metallic thermostatic arm 11 which is laterallydeflectable y Vunder the influence of heat The upper end of said arm issecured to the wall of the casing 10 by any suitable means as by thescrew 12. Above said arm 11 a bracket 14 projects` from the casing andis used to pivotally support a bell crank lever having a horizontallyextending arm 15 and a downwardly extending arm 16, the latter armhaving tapped therethrough an adj usting screw 17, the inner end ofwhich is operatively related to the free end portion of the thermostaticarm 11. The bracket 14 whereon the bell crank lever Fig. 2 is a sectionon line 2-2 of Fig. 1. i

1931. Serial No. 540,961.

just described is mounted, consists of a screw threaded stem 14a., abifurcated head 14?) and a lock nut 14o screwing on to said stem. Thebell crank lever. is pivotally secured to the bifurcated head 14oafter'the bracket 1'4 hasy beenV screwed into a screw hole v'providedtherefor in the wall'ofithe casing ,10.- The lock nut 140 servestosecurely maintain thel bracket 14 in the adjusted position. By thisarrangement the operative connection between the thermostatic arm llandthe valve 25 may be accurately regulated.

To the lower portionof the casing 10 is secured externally thereof themixing chamber fixture 20, the otherwise open end of which is more orless obstructed by an vadjustable cover 21 through which is fed the fuelpipe 22, these parts, separately considered form-v ing no part of thepresent invention.

' Fuel is fed to the pipe 22 past the fuel valve 25, said valve beingprovided with a stem 26 which is slidably contained within the fitting27,- said fitting being screwed into place as shown. Said valve stem 26operates through a stufling box 30, a wire stern 31 being tapped intothe end of said valve stem. The stem 26 of the valve is provided 'at itsouter end with a head 26a and armfv15 of the aforementioned bell cranklever, said arm 15 having a bifurcated end portion which passes alstridethe stem 31. lhe'n' the temperature ofthe radiator 'rises Vabove apredetermined amount the thermostat 4voperates the bell crank lever and`causes itsyarni 15 to press against the head v26a of the valve stem 26thereby shutting off further supply `of fuel to the burnerB. `When thetemperature decreases the hifurcated this head is in an koperativerelation to the arm 15 recedes from the head 26a of the valve y stem.and allows the valve 25 to reopen.

Owing tothe fact that the end portion of the wire'stem 31 is at allJcimes loosely contained within the socket which is provided in the -endportion of the valve stem 26, said valve stem aids in safely maintainingsaid wire vin itsslidable operative vposition inl alinement with saidstem. Hence avery simple Vand dependable construction, which is alsoeasy to assemble, is provided for the purpose set forth.

Before the fuel reaches the valve it is fed through an opening orpassage 42 which is controlled by the double diaphragm 36 within thediaphragm casing 37, said casing 37 preferably being provided with aperipheral flange 88 whereby it is secured to the main casing of theradiator. After passing through the opening 42 the fuelis delivered by achannel 39 to the intake side of the valve 25 already mentioned.y Thepassage 42 is controlled by the steam pressure, while the valve 25, asalready explained, is controlled by the external dry heat produced byradiation. e l ANormally when the heater is' in regular operation thesteamoperated double diaphragm 36 is spaced away from the main centralsupplyV opening 42, thus permitting the gas to freely enter theintermediate chamber from the supply chamber 41 through the port 42..l`From the intermediate chamber 40the fuel flows through the peripheraloutlet 39 past the valve 25 to the burner B. lVhen, however, thesteampressure rises suiiiciently to close vsaid central inlet o eninO-the onl @as admitted enters through the small by-p-ass opening 45 intothe intermediate chamber and thence out said peripheral opening tomaintain the operation of the burner B, which would other wise becompletely extinguished. The double diaphragm 86 and parts immediatelyVassociated therewith are not, separately considered, a part of thepresent invention and are therefore notl described in full detail.

In addition to the thermostatic control which includes the bi-metallicarm 11, another thermostatic control is provided, the latter controlbeing associated with the pilot burner 46 and being arranged to operatethe wire 31, the greater part of which is contained within a tube 465.Said pilot burner is supplied with fuel by tube 46m. This thermostaticcontrol is provided with a bimetallicl arm 50 constructed for lateralde-V flection like the arm 11 already described.

Said arm 50 is, however, preferably placed within the radiator and atvone end secured to the inner wall of the radiator by means of a screw51, the free end of said arm 50 being in an operative relation to theend of the-wire 31 which is tapped through the wall of the radiator asindicated in Fig. 4. The thermostatic arm 50 is placed so close to thepilot burner 46 that if the burner accidentally becomes extinguished thearm 50 will operate kthe wire 31 and thereby close the valve 25.

The operative connection between the wire 31 and valve-25 is best'shownin Fig. 2 where it will be seen that said wire is led through a bushingwhich has externally threaded end portions, a cap 56 being screwed uponthe outer end portion of said bushing. Said cap 56 has an aperturetherethrough into which the adjacent end of the tube 46 is tightly tted,means thus being providedto form a clamp tight fit. The wire 31 has asliding it within a socket provided therefor in the head 26a and outerend of the stem 26. This arrangement permits the bell crank arm 15 ofthe other thermostatic device to close the valve 25 without affectingthe position of the wire 31 or the operation of the thermostatic arm 50.

I claim:

1. In a device of the kind described, the combination, with a valve toadmit fuel, said valve having anoperating stem with a relatively deepsocket or bore in the end thereof, of two thermostatic devices eachadapted to close said valve independently of the other and withoutinterference with the other thermostat, one of said devices comprisingawire or stem having its end port-ion slidably and loosely fitted withinsaid socket and duringall operative positions retained therein andadapted to abut endwise against the bottom thereof, and the otherthermostatic device comprising an arm with a bifurcated vend portion.whichv straddles said wire and which is adapted to impinge upon the endof said valve stem to close the valve.

2. In a device of the kind described, the combination with a fuel valveand dual thermostatic means for actuating said valve; of a stem forminga part of said valve and projecting outwardly therefrom, said stemhavlng a relatively deep longitudinally extend-y ing socket in its outerend, and an operating rod projecting loosely into the socket of saidstem, said operating rod being connected with one of the themostaticcontrols .and the other thermostatic control having an operatingrelation to said valve stem independently of said rod,

In testimony whereof I hereunto affix my signature. v

AUGUST J. HARTFIELD.

